Sahih Al Bukhari 1: Chapter 2, Hadith 24

(24) AI-Haya (self- respect, modesty bashfulness, honour etc.) is a part of faith

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ أَخْبَرَنَا مَالِكُ بْنُ أَنَسٍ، ‏‏‏‏‏‏عَنِ ابْنِ شِهَابٍ، ‏‏‏‏‏‏عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ، ‏‏‏‏‏‏عَنْ أَبِيهِ، ‏‏‏‏‏‏أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَرَّ عَلَى رَجُلٍ مِنَ الْأَنْصَارِ وَهُوَ يَعِظُ أَخَاهُ فِي الْحَيَاءِ، ‏‏‏‏‏‏فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:‏‏‏‏ "دَعْهُ فَإِنَّ الْحَيَاءَ مِنَ الْإِيمَانِ".

SAHIH HADITH:

Narrated 'Abdullah (bin 'Umar): Once Allah's Apostle passed by an Ansari (man) who was admonishing to his brother regarding Haya'. On that Allah's Apostle said, Leave him as Haya' is a part of faith. (See Hadith No. 8)

REFERENCE:

Sahih Al Bukhari 1: Chapter 2, Hadith 24